Hey there!
I was wondering if there is a way of disabling the cursor during a cutscene and/or action list. It can be visible, just it should be disabled so the user cannot click on anything (including UIs) during the action.
We need this because we cannot pause the game during these actions because we want the main UI on the bottom to stay visible during normal gameplay and ONLY hide it during a cutscene (Which are handled through Dialogue System).

The subtitle BG/Text label are a seperate UI From the lower bar. But if i choose to run this action list, for example, with "Pause Gameplay", both the subtitle UI and the lower bar UI get hidden, which is NOT want we want. We simply need the cursor to be disabled entire while all UIs stay onscreen.
Comments
If so, I'm not sure of the reasoning - if you set the main UI's Appear type to Manual, you have complete control over its display, so it'll only hide when you tell it to. I'm guessing that it's currently set to During Gameplay, which will cause it to be automatically hidden when gameplay is blocked.
When set to Manual, you can use the Menu: Change state Action to control its visibility.
In answer to your question, however, you can disable the input, movement and interaction systems using the Engine: Manage systems Action.
See the Manual's chapter on "custom events" for more on how they work, but essentially you could have menu-changing ActionLists trigger whenever the game enters/exits the "Cutscene" state.